Year-over-Year (YoY) Appreciation
Year-over-year appreciation compares property value changes over 12 months. Understand how YoY metrics reveal market trends.
Definition
Year‑over‑year (YoY) appreciation measures the percentage change in a property’s value or a housing market’s median price over a 12‑month period. Calculated by comparing current values to those from the same month in the prior year, YoY metrics highlight long‑term trends while smoothing out seasonal variations. Investors, buyers, and analysts track YoY appreciation to assess market momentum, forecast future prices, and make informed decisions about buying or selling. High YoY appreciation may signal a hot market, while declining or negative YoY figures may indicate cooling conditions.
Why It Matters
One YoY figure drives a lot of pricing decisions, and it is usually the wrong figure for a specific house. A county median can rise 6 percent while condos in one submarket fall, because the median tracks what happened to sell, not what any given home is worth. Sellers anchored to last year's headline list too high and burn the first three weeks, which is exactly when the most motivated buyers are looking.
Examples
The King County median posts a 5.8 percent annual gain while two closed sales in a specific Kent townhome complex come in 3 percent lower, and the seller prices to the complex.
An owner who paid $540,000 in 2021 applies 4 percent a year and expects $630,000, then nets closer to $560,000 above the loan payoff after 6 percent in selling costs.
A market prints 18 percent appreciation one year and 1 percent the next, and an investor who underwrote continued double digit growth cannot refinance out as planned.
Tips
Compare the same month one year apart rather than against last quarter, since seasonal swings alone can manufacture a trend that does not exist.
Build your read from closed sales in your own development or within half a mile and of the same property type; county level appreciation is a news story, not a valuation.
Watch price per square foot next to median price, because a median can move purely because larger homes happened to close that month.
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